<div dir="ltr"><div><div>Hi Bob, <br><br>The studs you linked to are not correct as they are Cycle threads (CEI - Cycle Engineer Institute) on one end.  CEI threads are NOT Whitworth even though they are British threads as they have a 60 degree pitch angle of the threads versus the 55 degree pitch angle for ALL Whitworth form fasteners.<br><br></div>One solution I've seen that is easy is to just remove the studs and replace them with four short 1/4" BSF hex bolts in order to attach the balance pipe.   Not Concours but it works well.<br><br></div>Curt.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Apr 25, 2015 at 4:19 AM, Bob Haskell <span dir="ltr"><<a href="mailto:rchaskell@earthlink.net" target="_blank">rchaskell@earthlink.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thanks for the info.  The ones that I took off the manifold were brass threaded rod and the threads had stripped under the nuts.  I made some by cutting the heads off steel cheese head screws. It looks like British Fastener's may have the stud - <a href="http://britishfasteners.com/studs/bsf-bsf-studs/bsf-cei-1-4-x-1-long-stud-26-26-tpi-36.html" target="_blank">http://britishfasteners.com/studs/bsf-bsf-studs/bsf-cei-1-4-x-1-long-stud-26-26-tpi-36.html</a><span class=""><br>
<br>
Cheers,<br>
<br>
Bob Haskell<br>
AHCA 3000 Mk I registrar<br>
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<br></span><span class="">
On 04/24/2015 05:37 PM, Michael wrote:<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
Curt is correct...what's new...<br>
BSF both ends.<br>
<br>
Michael S<br>
BN1 #174<br></span>
------------------------------------------------------------------------<br>
From: Curtis Arndt <mailto:<a href="mailto:cnaarndt@gmail.com" target="_blank">cnaarndt@gmail.com</a>><span class=""><br>
Sent: ‎24/‎04/‎2015 2:23 p.m.<br></span>
To: Bob Haskell <mailto:<a href="mailto:rchaskell@earthlink.net" target="_blank">rchaskell@earthlink.net</a>><br>
Cc: Healey List <mailto:<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><span class=""><br>
Subject: Re: [Healeys] 100 carb balance pipe<br>
<br>
Hi All,<br>
<br>
I believe (almost certain) that the 1/4" studs on the manifold are BSF<br>
on BOTH ends.  IF they were coarse threaded into the aluminum they would<br>
be BSW, to match the BSF Whitworth threads on the other end.<br>
<br>
Cheers,<br>
<br>
Curt<br>
<br>
On Thu, Apr 23, 2015 at 4:09 AM, Bob Haskell <<a href="mailto:rchaskell@earthlink.net" target="_blank">rchaskell@earthlink.net</a><br></span><span class="">
<mailto:<a href="mailto:rchaskell@earthlink.net" target="_blank">rchaskell@earthlink.net</a>>> wrote:<br>
<br>
    Alan,<br>
<br>
    The threads are definitely BSF in these manifolds, but you're right<br>
    - coarse thread is usually the case in aluminum.<br>
<br>
    Thanks,<br>
<br>
    Bob Haskell<br>
    AHCA 3000 Mk I registrar<br>
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<br>
    On 04/23/2015 06:21 AM, Alan Seigrist wrote:<br>
<br>
        Bob -<br>
<br>
          From memory I believe they have a section that isn't threaded<br>
        in the<br>
        middle, with coarse thread to go in the manifold and fine thread<br>
        for the<br>
        nut.<br>
<br>
        Then again I probably have no clue what I'm talking about.<br>
<br>
        Alan<br>
<br>
        On Thu, Apr 23, 2015 at 6:01 PM, Bob Haskell<br>
        <<a href="mailto:rchaskell@earthlink.net" target="_blank">rchaskell@earthlink.net</a> <mailto:<a href="mailto:rchaskell@earthlink.net" target="_blank">rchaskell@earthlink.net</a>><br></span>
        <mailto:<a href="mailto:rchaskell@earthlink.net" target="_blank">rchaskell@earthlink.net</a><span class=""><br>
        <mailto:<a href="mailto:rchaskell@earthlink.net" target="_blank">rchaskell@earthlink.net</a>>>> wrote:<br>
<br>
             Listers,<br>
<br>
             The balance pipe is attached to each intake manifold with<br>
        two studs.<br>
             Are the studs just threaded rod, or is there a non-threaded<br>
        section in<br>
             the middle?  Assume that they're steel and overall length<br>
        an inch.<br>
             Threads are 1/4-26 (BSF/BSC).<br>
<br>
             Cheers,<br>
<br>
             Bob Haskell<br>
             AHCA 3000 Mk I registrar<br>
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</blockquote>
</blockquote></div><br></div>